package cn.taketoday.live.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.awt.image.BufferedImage;
import java.util.Hashtable;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

public class QrcodeUtils {

  @SuppressWarnings({ "rawtypes", "unchecked" })
  public static void creatRrCode(String contents, int width, int height, HttpServletResponse response) throws Exception {
    Hashtable hints = new Hashtable();

    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //容错级别最高
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  //设置字符编码
    hints.put(EncodeHintType.MARGIN, 0);                //二维码空白区域,最小为0也有白边,只是很小,最小是6像素左右
      BitMatrix bitMatrix = new MultiFormatWriter()
              .encode(contents, BarcodeFormat.QR_CODE, width, height, hints); // 1、读取文件转换为字节数组
      BufferedImage image = toBufferedImage(bitMatrix);
      //转换成png格式的IO流
      ImageIO.write(image, "png", response.getOutputStream());
//            byte[] bytes = out.toByteArray();
//            // 2、将字节数组转为二进制
//            BASE64Encoder encoder = new BASE64Encoder();
//            binary = encoder.encodeBuffer(bytes).trim();
  }

  /**
   * image流数据处理
   */
  public static BufferedImage toBufferedImage(BitMatrix matrix) {
    int width = matrix.getWidth();
    int height = matrix.getHeight();
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    for (int x = 0; x < width; x++) {
      for (int y = 0; y < height; y++) {
        image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
      }
    }
    return image;
  }
}
